In the ancient Chinese dynasties, this word was the greatest compliment one could give. Mostly used only to address royalty, anyone who was not a kou but used it to describe themselves were stoned to death.
If you are not a kou, don't try to be one. It will only get you stoned to death in China.
Kou , Pronounced 'kooo'
A more comical way of saying cum /spunk
p1:Youv'e got kou on your face
p2:oooo, its choclate.